Hey,
Im a complete noob in UNIX and this problem is killing me.
Im trying to write the stdin (which i receive from a pipe) to a file, but as always C crashes without no explanation. Here is what i have so far:
Thanx...
Hi All.
I have the following simple shell program.
It reads a number from the "/user/amit/bldno";
for example: file "bldno" contains value "100"
After execution of the program the content should change to 101.
---------
#!/usr/bin/tcsh
V= `cat /user/amit/bldno`
echo $V
`rm -rf ... (1 Reply)
if test -z "$1"
then echo "you must give a filename or filepath"
else path=`dirname $1`
f_name =`basename $1`
if path="."
then path=`pwd`
fi
fi
cat $f_name $path >> index.txt
The only problem I am encountering with this is writing $path to index.txt
Keeps going gaga:
cat:... (1 Reply)
Hi All
I am new to C and trying to write a code to get a file as an output.
My text file should look like:
<var1>tab<var2>tab<var3>...upto the elements in an array
<varb1>tab<varb2>tab<varb3>...upto the elements in an array
Can someone please guide me how to write the code or a sample... (3 Replies)
Need to develop a unix shell script for the below requirement and I need your assistance:
1) search for file.log and file.bad file in a directory and read them
2) pull out "Load_Start_Time", "Data_File_Name", "Error_Type" from log file
4) concatinate each row from bad file as... (3 Replies)
Help needed...
Can you tell me how to compare the last two couple entries in a file and print their result in new file..:confused:
I have one file
Check1.txt
\abc1 12345
\abc2 12327
\abc1 12345
\abc2 12330
I want to compare the entries in Check1 and write to... (1 Reply)
I am looking to do a ls on a folder and have the output of the ls be structured so that is is modificaiton date, file name with the date in a format that is compatible with mysql. I am trying to build a table that stores the last modification date of certain files so I can display it on some web... (4 Replies)
Hi
I am trying to extract information out of a file but keep getting grep cant open errors
the code is below:
#bash
#extract orders with blank address details
#
# obtain the current date
# set today to the current date ccyymmdd format
today=`date +%c%m%d | cut -c24-31`
echo... (8 Replies)
Hi All,
We have a Unix program in oracle when we run the program this connects to specified ftp and will get the file into local server.
We are facing a problem like when file writing operations is not completed, this program is getting the incomplete file.
Could anyone please help me... (2 Replies)
Hi,
I have 1000 files names data1.txt through data1000.txt inside a folder. I want to write a script that will take each first line from the files and write them as output into a new file. How do I go about doing that? Thanks! (2 Replies)
Hello ,
I have comma delimited file with over 20 fileds that i need to do some validations on. I have to check if certain fields are null and then write the line containing the null field into a new file and then delete the line from the current file.
Can someone tell me how i could go... (2 Replies)
Discussion started by: goddevil
2 Replies
LEARN ABOUT MOJAVE
authopen
AUTHOPEN(1) BSD General Commands Manual AUTHOPEN(1)NAME
authopen -- open file with authorization
SYNOPSIS
authopen [-stdoutpipe] [-extauth] filename
authopen [-stdoutpipe] [-extauth] -w [-a] filename
authopen [-stdoutpipe] [-extauth] -c [-x -m mode -w] filename
authopen [-stdoutpipe] [-extauth] -o flags filename
authopen -h
DESCRIPTION
authopen provides authorization-based file opening services. In its simplest form, authopen verifies that it is allowed to open filename
(using an appropriate sys.openfile.* authorization right) and then writes the file to stdout. If -w is specified, authopen will read from
stdin and write to the file.
authopen is designed to be used both from the command line and programmatically. The -stdoutpipe flag allows a parent process to receive an
open file descriptor pointing to the file in question.
Before opening filename, authopen will make an authorization request for a right of the form:
sys.openfile.[readonly|readwrite|readwritecreate]./fully/qualified/path '.readonly' rights only allow for read-only file descriptors.
'.readwrite' rights allow for read/write file descriptors. '.readwritecreate' rights allow for read/write descriptors and the creation of
new files.
The -extauth option can be used to provide an AuthorizationRef constructed by the client. This generally prevents authopen from presenting
an authorization dialog containing its own name.
OPTIONS -stdoutpipe specifies that STDOUT_FILENO has been dup2()'d onto a pipe to a parent process and that an open file descriptor to filename
(with the appropriate access mode) should be sent back across it using the SCM_RIGHTS extension to sendmsg(2) rather than having the
file itself written to or read from stdin / stdout.
-extauth specifies that authopen should read one AuthorizationExternalForm structure from stdin, convert it to an AuthorizationRef, and
attempt to use it to authorize the open(2) operation. The authorization should refer to the sys.apenfile right corresponding to the
requested operation. The authorization data will be read before any additional data supplied on stdin, and will not be included in
data written with -w.
-w instructs authopen to open filename read/write and truncate it. If -stdoutpipe has not been specified, authopen will then copy
stdin to filename until stdin is closed.
-a append to filename rather than truncating it (truncating is the default).
-c create the file if it doesn't exist. -m requires -c.
-m mode specify the mode bits if a file is created.
-o flags numerically specify the flags that should be passed to open(2).
-x require that the file being created not exist.
EXAMPLES
To replace /etc/hostconfig (assuming sys.openfile.readwrite./etc/hostconfig or better can be obtained):
$ cat tmpdata | authopen -w /etc/hostconfig
ERRORS
authopen will fail if an appropriate sys.openfile.readonly.*, sys.openfile.readwrite.*, or sys.openfile.readwritecreate.* right cannot be
obtained or if the named path does not exist.
BUGS
authopen should support prefix path authentication such that the right sys.openfile.*./dev/ could give access to all /dev entries and
sys.openfile.*./dev/disk1 could give access to all disk1-related /dev entries.
authopen should use getopt(3).
LOCATION
/usr/libexec/authopen
SEE ALSO open(2), Security/Authorization.h, realpath(3), recvmsg(2).
W. Richard Stevens, "Passing File Descriptors", Advanced Programming in the UNIX Environment.
HISTORY
authopen appeared in Mac OS X 10.1 to assist with the manipulation of disk devices.
Darwin 28 Feb 2013 Darwin